Highly Enantioselective Synthesis of 3<i>a</i>-Fluorofuro[3,2-<i>b</i>]indolines via Organocatalytic Aza-Friedel–Crafts Reaction/Selective C–F Bond Activation
diverse C–F bond activation methodologies. However, the selective activation of polyfluorinated compounds remains challenging. Herein, we describe an unprecedented strategy for synthesizing enantioenriched fluorofuro[3,2-b]indolines through the organocatalytic aza-Friedel–Crafts reaction coupled with selective C–F bond activation. These reactions feature excellent enantioselectivities (≤96% ee) and yields
氟烷基化化合物在药物发现中受到高度关注,并激发了多种 C-F 键激活方法的发展。然而,多氟化合物的选择性活化仍然具有挑战性。在此,我们描述了一种前所未有的策略,通过有机催化氮杂-Friedel-Crafts反应与选择性C-F键活化相结合来合成对映体富集的氟呋喃[3,2- b ]二氢吲哚。这些反应具有优异的对映选择性(≤96% ee)和产率(≤96%)以及良好的官能团相容性。通过19 F核磁共振实验进行的机理研究为硅胶作为这一转变的关键介质提供了充分的支持。
B(C6F5)3/CPA‐Catalyzed Aza‐Diels‐Alder Reaction of 3,3‐Difluoro‐2‐Aryl‐3H‐indoles and Unactivated Dienes
Herein, we describe B(C6F5)3/CPA-catalyzed enantioselective aza-Diels–Alder reaction of 3,3-difluoro-2-Aryl-3H-indoles with unactivated dienes to access chiral 10,10-difluoro-tetrahydropyrido[1,2-a]indoles in good yields with good to excellent ee. The resulting cycloadducts containing an CF2 unit could be further transformed into other important building blocks.
在此,我们描述了 B(C 6 F 5 ) 3/ CPA 催化的 3,3-二氟-2-芳基-3 H-吲哚与未活化的二烯的对映选择性氮杂-狄尔斯-阿尔德反应,得到手性 10,10-二氟-四氢吡啶并[1,2- a ]吲哚的产率良好,ee 良好至优异。所得的含有CF 2单元的环加合物可以进一步转化为其他重要的结构单元。